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#include <iostream>
#include <type_traits>
template <typename T>
inline constexpr bool is_char_v = std::is_same_v<T,char> || std::is_same_v<T,wchar_t> || std::is_same_v<T,char16_t> || std::is_same_v<T,char32_t>;
template<typename T>
inline constexpr bool is_arithmetic_not_char = std::is_arithmetic_v<T> && !is_char_v<T>;
template<typename A, typename B>
double sum(A a, B b) {
if constexpr (is_arithmetic_not_char<A> && is_arithmetic_not_char<B>)
return a + b;
else
return 0;
}
int main()
{
std::cout << sum(10, 65) << std::endl;
std::cout << sum(10, 'A') << std::endl;
return 0;
}
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